i PSV WHOLE-HOUSE VENTILATION SYSTEM
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1 CI/SfB (57) Uniclass Ss_65_40_33_56 November 2017 i PSV WHOLE-HOUSE VENTILATION SYSTEM Humidity-sensitive wall ventilator Energy saver vent
2 HOW TRADITIONAL PASSIVE STACK WHY VENTILATE? VENTILATION WORKS... The home environment should be designed for comfort and health, whilst at the same time minimising energy consumption. Such design requires a balance of three elements: heating, insulation and ventilation. All three are equally important to the indoor environment and the wellbeing of the occupants. Ventilation is required: To remove water vapour generated by washing, cooking, showers, washing machines, tumble driers and people breathing. Excess water vapour can lead to harmful condensation if it is not managed by ventilation. For comfort, to bring fresh air into the building to avoid nausea and stuffiness. For health, to remove atmospheric pollutants which can cause allergies and chemicals released by building materials and furniture. Ventilation is essential but has an energy cost. It is therefore vital to select the most energy efficient form of ventilation. The consequences of inadequate ventilation are well documented and include surface and interstitial condensation, stuffy atmospheres, lingering odours and in the worst cases, mould growth. Standard passive stack ventilation (PSV) works by being primarily driven by the natural stack or convection effect by which warm air rises, entering a vertical duct to be exhausted at higher level reaching colder outside air. The air inside a house is almost always warmer than outside. As the warm air rises it carries water vapour with it. There is an additional contribution from wind flow across the roof which creates a suction effect at the terminal (the Venturi effect ). This wind benefit is not essential to the operation of the system and experience shows that the system will continue to function even in still weather conditions. The traditional PSV system is permanently open so has the risk of unnecessary heat loss from the building especially in winter time. The United Kingdom now has different Regulations for each of the countries as follows: England & Wales - Approved Document F. Scotland - Technical Handbook Domestic Section 3. Northern Ireland - Technical Booklet K. Republic of Ireland - Technical Guidance Documents Part F. All require that adequate ventilation is provided for people within buildings. One recognised method referenced in all documents is the use of passive stack ventilation. 2 Photographs to the left show the results of harmful condensation....
3 ... HOW GLIDEVALE i PSV IS DIFFERENT Shortcomings of traditional PSV New buildings are progressively being built in a more airtight manner, and as such more consideration must be given to the ventilation system to reduce condensation risk. As energy efficiency standards also improve, limiting heat loss through ventilation also becomes increasingly important. Clearly a balance has to be struck between energy use, restricting unnecessary ventilation and heat loss, and the control of condensation. In standard PSV systems, the siting of inlets and extracts ensures that air always moves from dry rooms to wet rooms (kitchens, bathrooms etc). The air then passes through ducting to roof terminals where it is vented to the outside. No fans are required so no power is used. There is no automatic control so in winter, heat is lost from the building via the stack as it remains permanently open with fresh air being supplied by background ventilators which are often located in windows. The system can therefore over-ventilate and cause increased energy costs. The use of ventilation controls can minimise energy consumption and unnecessary heat loss in winter. These can comprise some form of regulation to the system, either by user intervention or preferably demandcontrolled ventilation providing regulation to the system dependent on conditions without user intervention. Glidevale ipsv is controlled by intelligent air inlets and extracts. These respond automatically to changes in relative humidity, thereby modulating the ventilation rate in each room to meet the varying need. Ventilation levels are matched to demand. When room humidity is low, the ventilation rate is minimised, irrespective of external weather conditions, preventing unnecessary heat loss. When room humidity is high, the ventilation rate increases, removing moisture rapidly when need is greatest. The airflow rate responds continuously to demand, so maximising ventilation effectiveness and minimising heat loss through loss of warm indoor air. Both extract grilles and air inlets use non-electrical, humidity-sensitive control. Nylon strands in each unit expand or contract in response to humidity levels. This automatically regulates the size of the air opening and varies the ventilation rate accordingly. The operating range between minimum and maximum opening of the vents is 30% to 75% relative humidity. This method of control uses no electrical power. High humidity These diagrams illustrate a Glidevale ipsv intelligent controlled system to keep heat loss to a minimum yet provide adequate ventilation when conditions demand it. Low humidity A161 humidity-sensitive extracts in kitchen and bathroom
4 BENEFITS OF GLIDEVALE i PSV... Demand control for comfort The Glidevale ipsv system provides fully automatic, demand-controlled ventilation. It responds to peak humidity levels and hence to the occupant s activities, giving optimum comfort conditions. Whole-house ventilation The Glidevale ipsv system ventilates the whole-house by responding to demand in each space providing the appropriate level of ventilation, room by room, 24 hours a day. Energy efficient The Glidevale ipsv system needs no input of power so there are no direct CO 2 emissions as a result of ventilating the property. This cannot be said for any other ventilation strategy. Combat condensation and mould Assured, effective ventilation helps to combat condensation and mould growth. This brings long-term health benefits and minimises future refurbishment costs. Continuous extraction The continuous, gentle extraction of the Glidevale ipsv system is silent, unobtrusive and therefore unlikely to be tampered with by unknowing occupants. Continuous low-level ventilation is more effective in removing lingering humidity. Background ventilation is required in conjunction with an ipsv system to provide whole-dwelling ventilation complying with Approved Document F. Glidevale window and wall vents provide controllable ventilation at a relatively low level to meet the regulatory requirements. Glidevale ipsv requires only one background ventilator per dry habitable room to meet the Regulations, as stated and shown in the independent BBA certification. BBA certification is recognised as an Alternative Approach to meet the requirement of. In contrast, a standard PSV system would require several ventilators per habitable room, needing multiple unsightly wall / window penetrations. 4 Automatic boost effect Humidity-sensitive control provides an automatic boost effect as an integral feature by allowing greater air flow when condensation risk is high. As the humidity levels fall, the air flow is reduced. Ideal for disabled and older people With automatic response and no operating controls, the Glidevale ipsv system is ideal for disabled and older people. Meets building requirements The Glidevale ipsv system meets the requirements of Building Regulations and Standards in England, Wales, Scotland and Ireland. BBA certification has been in place since 1996 and was reviewed again in 2015 against present requirements. Simple installation The Glidevale ipsv system is easily installed: it needs no electrical connections and once installed, no further adjustments or commissioning are required. This makes it ideal for both new build and refurbishment projects. Minimal maintenance / lifetime cost savings Simple and reliable components with few or no moving parts means minimal maintenance. The comparison between initial purchase and ongoing maintenance costs of the Glidevale ipsv and mechanical ventilation heating recovery (MVHR) systems shows substantial savings for the building owner over the life of the building. Unrivalled experience and a proven record The Glidevale ipsv system has been sold since 1984 and whilst continuously developed over that time with new and innovative features, it has remained a proven ventilation system even in the most airtight of buildings. Fresh TLF air supply ventilator...
5 i PSV WHOLE-HOUSE VENTILATION SYSTEM AIR SUPPLY - BACKGROUND VENTILATION Energy Saver Vent and Ultra Grille Fresh 99H Background ventilation units Glidevale has a comprehensive range of window vents (Tricklevent range) and wall vents (Fresh range) to meet most requirements. Controllable, secure and designed to avoid draughts. Automatic humidity-controlled options to ensure that the whole ventilation strategy needs no user input. Acoustic vents provide good sound insulation for noisy locations, and are available as part of a BBA approved system. Colour co-ordination: Ultra Vent and Grille tricklevents can be supplied in any RAL colour to match windows. Fresh external wall grille Fresh TLF Glidevale background ventilation units Free area Equivalent area Features mm 2 mm 2 Through-frame vents Ultra Vent and Grille 5400/ /4000 Slim profile Energy Saver Vent* Humidity-sensitive and Ultra Grille Wall vents Fresh 99HdB Fresh 80* Round vent, pull cord Fresh 90* Aesthetic vent, slide control Fresh 100* Round vent, pull cord Fresh TLF* Aesthetic vent, slide control Fresh 99H* Automatic humidity-sensitive round vent *Acoustic versions also available Fresh TLFdB Ventilation area is defined by in term of equivalent area (England and Wales) or free area (remainder of UK and Ireland). Free area is simply the size of the ventilation aperture. Equivalent area provides a measure of the actual airflow performance of the vent and is determined by the method of BS EN :
6 ... AIR EXTRACTION - EXHAUST TERMINATION... Terminals There is a range of terminals to suit pitched and flat roofs. Ridge terminals are usually recommended where possible, but tile terminals can be used where necessary. All terminals are AA fire rated to BS 476 Part 3. Air extract PRT Ridge terminal A161 Humidity-sensitive extract. Normally ceiling-mounted, wallmounted option available. Ducting TT9 Universal Soaker style slate terminal F1252 Insulated flexible ducting, length 4.0m. F1251 Uninsulated flexible ducting, length 3.0m. TT9 Versa-Tile terminal PC1252M Uninsulated rigid ducting, length 2.0m (available to order). FCD1 Flat channel ducting, length 1.5m. 6...
7 ... i PSV KITS FOR WET ROOMS... Ground floor (kitchen, utility and other wet rooms) First floor (bathroom, shower room, ensuite etc) ipsv Kit 10 ipsv Kit 11 ipsv Kit 12 ipsv Kit 13 Ceiling extract, flat ducting Ceiling extract, circular ducting Wall extract, flat ducting Ceiling extract F1252 F1252 F1252 F1252 PMC01 PMC01 A161 MC01 FCA6 FCA6 FCD1 F1251* FCD1 FCA3 FCA3 FCD1 FCD1 FCA6 A161 A161 * Alternative rigid ducting is available to order. A161 FCA11 FCA10 Please note, where standard ipsv kits are not suitable for the property layout, alternative configurations can be supplied. Extension ducting is also available for properties over two storeys. Code Component A161 Humidity-sensitive extract F1251 Uninsulated flexible ducting, 3.0m F1252 Insulated flexible ducting, 4.0m PC1252M* Uninsulated rigid ducting, 2.0m FCA3 Flat channel straight connector PMC01 Plastic sleeve coupling, male 125mm FCA6 Flat channel circular adaptor FCA10 Flat channel elbow connector FCA11 Round pipe FCD1 Flat channel ducting, 1.5m MC01 Metal sleeve coupling, male 125mm PRT Ridge terminal TT9 Tile/slate terminal Speed clamp * Available to order Terminal options PRT ridge terminals For clay ridges PRT25: half round ridge terminal For concrete ridges PRT15: half round ridge terminal PRT35: segmental ridge terminal PRT45: angle ridge terminal PRT46: angle ridge terminal PRT301: legged angle ridge terminal Where a suitable ridge terminal is not available, the use of a TT9 is the alternative terminal solution as close to the ridge as possible (no more than 0.5m) and on the leeward side of the roof. TT9 Versa-Tile terminal** TT9 Universal Soaker style slate terminal** ** Profile dedicated terminals are available where the above options are not suitable.... 7
8 DESIGN GUIDANCE Use insulated ducting in the roof void and other unheated spaces Air flow from dry to wet rooms Habitable room (e.g. bedroom) Habitable room (e.g. living room) Site air inlets in each habitable dry room (living room, bedrooms etc) Glidevale offers a design service for ipsv systems based on building drawing supplied. Design points The main design points are given (see below). The layout shown is schematic and actual installations may differ in detail. Designs should also follow the guidance given in Approved Document F1 Table 5.2b. with exception of background ventilation provisions. Design guides A number of independently produced guidance documents make recommendations for the installation of PSV or intelligent PSV. PP3/99 Sustainable Homes: Embodied Energy in Residential Property Management published by BRE, Housing Corporation and Hastoe Housing Association. Support flexible ducting every 300mm to prevent sagging There is usually sufficient air flow around internal doors to provide a flow of replacement air. If this is insufficient a door undercut of 10mm or an air transfer door grille should be used. Each duct must run to a separate terminal Wet room (e.g. bathroom) Terminals must be no more than 0.5 metre down from the ridge Ducts must rise vertically or near-vertically, preferably not more than 45 from vertical with a maximum of two bends Within the building, run circular ducting in a room corner or inside a fitted cupboard or wardrobe. Alternatively run flat channel ducting within a stud partition. Site air extracts in each wet room (kitchen, bathroom) Wet room (e.g. kitchen) Best practice guidelines state: Design for long life (at least 60 years and preferably more). Do not install ultra high tech equipment that offers only marginal energy savings in use. Avoid systems with high maintenance requirements or which need frequent replacement. Avoid systems which rely heavily on user regulation to achieve energy savings (e.g. use intelligent self-regulating passive stack ventilation rather than usercontrolled systems). Glidevale i PSV meets all these criteria. BRE Information paper IP13/94 Passive Stack Ventilation Systems: Design and Installation provides information and guidance regarding the design and installation of PSV systems. Design information is also given in BBA Certificate 96/3273. Other products from Glidevale: Cavity trays and preformed DPCs. Ground floor gas & damp protection products. Tile and slate ventilators. Abutment ventilation. Loft access traps/ladder. Eaves and low level ventilation systems. Specification clause Ventilation to be provided by means of a BBA certified whole-house intelligent passive stack ventilation system complying with: (England and Wales) Approved Document F*. Building (Scotland) Regulations Technical Handbook Domestic Section 3*, (Northern Ireland Technical Booklet K*, (Republic of Ireland) Technical Guidance Documents Part F*. The ventilation system to be Glidevale ipsv wholehouse system covered by BBA certificate 96/3273, supplied by Glidevale, 2 Brooklands Road, Sale, Cheshire M33 3SS, tel: , fax: , technical@glidevale.com. Design and layout of the system to be in accordance with the manufacturer s recommendations. Installation to be in accordance with the manufacturer s instructions and any other design recommendations supplied. *Select as appropriate Stockist s stamp GLIDEVALE 2 Brooklands Road, Sale, Cheshire M33 3SS Tel: Fax: info@glidevale.com Web: Glidevale maintains a policy of continuous development and reserves the right to amend product specifications without notice. ipsv is a registered trademark. A division of Building Product Design Ltd. Company Registration No; November ISO 9001 OHSAS 18001
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